Boring jig



May 21, 1957 B. A. MCCUEN BORING JIG 2 sheets-sheet 1 Filed Dec. 2, 1952 t" INVENTOR Buron MCCLLGYL BY 45W' TTORNEY B. A. MCCUEN l May 2l, 1957 BORING JIG Filed Dec. 2, 1952 2 Sheets-Sheet 2 lNvENToR ,Burton A. McCue@ nited Stlts` Patnto l.

pendent Lock Company, Fitchburg, tion of Massachusetts Application December 2, 1952, Serial No. 323,677

l 2 Claims. (Cl. 77-62) assigner to Inde- Mass., a corpora- This invention relates to boring jigs and more particularly to boring jigs for the formation of drill holes on doors and still more particularly for a drill jig for the lrilll holes on doors for mounting cylindrical and tubular oc s.

With the development of cylindrical and tubular locks and latches, the preparation of the door to receive the latch -bolt casing and knob retractor mechanism has required unusual skill by reason of the size of the boring required. Special problems are also encountered in view of the variety of materials of which `the doors are made.

It is an object of this invention to provide a jig for preparing doors to receive locks to elect this operation quickly, economically and with great accuracy and without unusual skill, and at the same time assure the preparation of the door with the proper borings, without special attention being given to whether the doors are made of solid wood Stiles or compositions or combinations of materials.

To attain these objects and such further objects as may appear herein or tbe hereinafter pointed out, I make references to the accompanying drawing, forming a part hereof, in which- Figure is a fragmentary perspective view of a door illustrating the borings intended to be formed therein;

Figure 2 is a magnied sectional View showing the jig in -accordance with this invention in the boring position;

Figure 3 is an end view of the jig;

Figure 4 is a section taken on the line 4 4 ure 3;

Figure 5 is a section taken on the line 5--5 of Figure 4;

Figure 6 is a fragmentary detail of an auger head in accordance with another embodiment;

Figure 7 is a fragmentary detail of an auger head in accordance with a still further embodiment.

Making reference to the drawing, this invention is particularly designed to prepare a door 10 with an edge boring 11 and a transverse Iboring 12. The types of borings are intended to receive in the boring 11 a tubular latch casing and in the bor-ing 12 the knob lock mechanism of lock sets, in which the mechanism is primarily controlled through the knob, and which heretofore has required the use of an auger up to 21A; in diameter to receive the latch retractor mechanism.

For carrying out the foregoing I make reference to the jig l13 comp-rising a rear jaw or clamp member 14 having a head 1S and a supporting ring 16 integral therewith. The clamping face 17 adjacentrthe supporting ring sur- -face is provided with an annulus or lip 18 terminating in a sharpened edge 19, -for purpose which will appear as this description proceeds.

The shank portion 20 of the rear jaw or clamp member lies in complemental position to the front jaw 21, one end of which 22 terminates in a boss 23 having a screw threaded bor-ing 24 axially aligned with the center of the supporting ring 16 of the rear clamp member 14. Through the threaded boring 24 there is positioned the screw threaded shank 25 for threadedly feeding the shank along the boss 23. The shank 25 has mounted at its end 26 an auger head 27, lying transversely of the shank and comprising a face cutter 28 radially extended along `the head, with a clearance face or rake on its faces 29 and 30 designed for cutting `wood as used in` door of Figframes. A scoring arm 31 has an edge 32 diametrically terminating in an arcuate scoring spur v33. The auger is disposed to one side of the center spur 34, which is desirably free from threaded sections and may be of pyramidal contour and formed with three or more ifaces 35, to provide some lateral cutting and self-cleaning sunfaces.

The opposite 4free end 36 of the shank 2.5 is squared or otherwise formed with a keying outline to receive the crank hub 3'7 in keying engagement with the squared slot 38. The crank handle 39 may be extended in accordance with the mechanical advantage which may be found desirable. The boss23 extends from a web 40 to one side of an arcuate extension 41 from the lfront jaw 21 providing an inner, partly cylindrical cup 42 about' the pressure face 43.

For disposingV the jig in clamping engagement with a door edge, the Shanks of the rear jaw 14 and front jaw menu-ber 21 are each provided with actuating elements comprising a guide pin 44 which extends ,from the shank 20 so that its free end 45' projects slidably through a guide slot 46. Cooperating Iwith the guide pin 44 there is a feed screw 47, having adjacent each yend oppositely pitched screw threads 4S and 49, threadedly engaging complemental boring-s 5t) and 51 in the rear shank 29 and front jaw 21, respectively..

The feed screw 47 has its free end provided with a turn knob 52 for shifting the clamp members uniformly to and from each other and to slide the tubular bit guide 53 equally spaced between the rear shank 2l) and front jaw 21. The bit guide has a flange 54 formed with a slot 55, in which rotates the trunnion portion 56 medially of the shank 47 and which is formed between flanges 57 and 58, so that with the rotation of the shank 47, the tubular bit guide 53 is always centrally spaced.

A locking -bolt 59 is threa-dedly engaged in .the threaded boring 60 of the `front jaw 21 and has a nose portion 61 slidably directed through a boring 62 formed in the flange 54 of the :bit guide. The nose 61 of the bolt 59 extends into `a socket 63 formed in the .shank 20. A turn knob 64 may threadedly direct the locking bolt 59 into or yfrom the opposed shank 20.

With the construction as described, the boring jig is positioned over the door edge by disposing the head 15 and front jaw 21 to opposite faces of the door, locating the ring 16 at a predetermined position along the edge. Thereupon, the turn knob 52 is actuated to bring the jaws into clamping engagement, abutting the edge 65 of the bit guide with the edge of the door. When firm clamping engagement has been achieved, the locking bolt 59 is tightened to hold the jig assembly firmly in position. The crank 39 may now be rotated into thread feeding and cutting direction, thereby thread feeding the auger head 27 forwardly and cutting through the door body from one face of the door to the other until the cutter head enters the supporting ring 16.

The auger head may thus be driven completely `through without reversing the position of the auger as in prior practice, since the center spur 34 serves merely axially to guide the stem 25 in alignment with the boring 24 of the boss 23 and the ring 16. A long throw between the point of support in the boss 23 and the opposed edge of the door does not detract from the accuracy of Vthe boring operation. The boring operation may progress from one face to another as the center 34 is not required to bite into the material and feed the auger into biting `j engagement. The cutting engagement between the pointed annulus 19 and the spur 33 assures a clean hole,

free from any tendency to splinter the facing material of the door as it passes centrally into the ring.

By the foregoing construction, plywood doors or doors filled with various compositions may be bored withthe;

Ptented May 21, 1957` jig with one setting of the auger at one side of the door.

It will be understood also that when the jig is set in position, the brace and bit for drilling the hole 11 may be kept in' position and where the bit 66 is` partially drilled, 4the anchorage of the jig, is augmented. and the jig is held against any tendency for displacement during the boring operation by the auger 27,

By threadedly engaging the auger head into boring position, the manual force is confinedV to` rotating the crank 37, and the carpenters personal judgment as to the pressure to be exercised is not required.

By employing a relatively low pitch thread` for the shank as compared with the pitch of the cutter 23, an ex ceedingly clean and uniform boringy operation is assured, with true alignment axially from one faceof the door to the other as in operating a brace and bit to keep the bit normal to the holel being drilled independently of the skill of the operator. Atrue boring is likewise assured independently of the material of the door so that plywood doors with various cores or fillers need not be specially handled, to eifect the desired boring operation, and complete boring being accomplished as rapidly as it takesr to threadedly drive the shank 37 through the thickness of the door, the number of threads per length of the shank 25 determining the number of revolutions of the crank 39 to effect a boring.

It will be understood that while I have shown and described a wood auger in which the feed threadedly controls the cutter head employing a center I may, as shown in Figure 6, provide threads in the center. For this purpose, I illustrate in l-"igure 6 a cutter head 27a, in which the center 34a is formed with a lead thread in the manner customarily found in augers of this character, and a spiral helical screw thread is formed thereon the same as the thread of the auger shank. This may prove desirable in boring relatively thick wood doors or backset borings of greater magnitude than illustrated.

Likewise, by the construction I find that economies may be efected by providing the auger 27h as shown in Figure 7 with a removable cutter 28a, whereby the cutter may be removed for sharpening or replacement.

It is to be observed that in my boring jig various bit guide adapters, augers and guide sleeves may be substituted in accordance with the work to be performed and the mechanical advantage of the crank arm which is used to rotate the auger shaft. It is to be observed that a reduction in friction of the auger head to the shaft guide should be maintained and I have found that for an auger head of about 1% inches, sharpened for cutting wood, an auger shaft of about one half inch, with a thread feed of twenty-four threads to the inch will provide high speed boring within normal manual operation by an eight inch crank arm.

It will be observed that in the forms shown in Figures 6 and 7 comprising an auger head in which the center is iscrew-threaded with a combined helical and spiral thread,

, nd it desirable to hold the jig in position proceeding from one face through to the other in one operation or one setting of the boring jig, I may reverse the operation from one face to the other if the position of the hole to be bored and the materials into which the boring is to be made may find it expedient.

By my construction high speed manual drilling of the lock mounting may be made on wooden or like doors with accuracy and with low cost equipment.

Specific phases of subject matter in this application have been transferred to my application Serial No. 404,097, filed January 14, 1954, entitled Boring Jig Construction, which is a continuation-in-part of the present application.

asomar Having thus described my invention and illustrated its use, what I claim as new and desire to secure by Letters Patent is:

1. In a boring jig for forming; the transverse drill hole through opposite faces of awood door frame member or the like, the combination comprising a jaw clamp niember and an auger guide jaw member, shanks extended from the same and means for coupling theV Shanks and jaws substantially in parallelism, said coupling means including backset locating guide means for determining the position of the transverse drill hole relative to the edge of the door frame member to be drilled, means for adjusting said couplingl means to vary the spacing of the backset locating guide means and Shanks, for doors of varying thickness, the auger guide jaw member having a boss including a screw-threaded guide whose axis is substantially normal to the plane of the clampingy face of the first jaw member, an auger head having a shank cornplementally threaded to the screw-threaded guide of said boss, threadedly to feed said; auger head upon rotation, for transverse boring in a direction normal to the face of the first jaw clamp member, the feed of the auger augmenting the anchorage of the jig throughout the boring operation to hold the jig against any tendency for displacement during boring operations by the auger, said first jaw member having a ring substantially comple mental to the said auger head, and concentric to the axis` of the screw-threaded guide of said boss whereby the auger may be,v directed from one face through to the other face of the door frame member, the ring cooperating with the auger to form the drill hole substantially free from any tendency to splinter the facing material of the door frame.

2. In a boring jig for forming the transverse drill hole through opposite faces of a wooden door frame member or the like, the combination comprising a jaw clamp member and an auger guide jaw member, shanks extended from the same substantially in parallelism, each provided with complemental actuating means and guides including a clampV screw in back set position for shifting and moving the clamp jaws to and from cach other, the second jaw member having a boss including a screw threaded guide whose axis is substantially normal to the plane of the clamping face of the first jaw member, an auger head having a shank complementally threaded to the screw threaded guide of said boss, threadedly to feed said auger head upon rotation for transverse boring in a direction substantially in parallelism to the` axis of a clamp screw for the clamp jaws, the feed or" the auger augmenting the anchorage of the jig throughout the boring operation by the first clamp screw means for the clamp jaws, to hold the jig against any tendency for displacement during boring operation by the auger, said rst jaw member being a ring substantially complemental to said auger head, whereby the auger may be directed from one face through to the other, the ring cooperating with the auger to form the drill hole substantially free from any tendency to splinter the facing material.

References Cited in the tile of this patent UNITED STATES PATENTS 447,176 Campbell Feb. 24, 1891 1,603,652 Waller Oct. 19, 1926 1,861,289 Abramson May 3l, 1932 1,919,900 Moller July 25, 1933 2,033,072 'Harp Mar. 3, 1936 2,193,204 Nilson Mar. 12, 1940 2,230,645 Jones Feb, 4, 1941 2,332,295 Bouchal Oct. 19, 1943 2,351,243 Vetter June 13, 1944 2,602,238 Wellman July 8, 1952 FOREIGN PATENTS 154,073 Great Britain Nov. 25, 1920 

